86 



PRINCIPLES OF FEEDING FARM ANIMALS 



have thicker walls than those of the low protein lot. Figure 

 19 shows a lot of pigs at the beginning of an experiment in 

 which they were fed corn and mineral matter. Figure 20 

 shows the same pigs after 196 days on this ration. Thus, 

 when fed to hogs, and especially to grooving pigs, corn should 

 be supplemented not only by mineral matter but also by 



Fig. 19. — Pigs at the begiuuing of a 196-day feeding period upon corn 

 alone. Average weight, 39 pounds. (Kentucky Experiment Station.) 



some nitrogenous feed, as tankage, middUngs, oil meal, 

 clover or alfalfa pasture, which furnishes the essential 

 amino acids in which corn is deficient. To the other classes 

 of farm animals, corn often is fed with a nitrogenous rough- 

 age as clover or alfalfa hay which, to a large extent at least, 

 may furnish the essential amino acids in which the corn is 

 deficient. However, when corn is fed to growing animals with 

 a non-nitrogenous roughage, such as corn silage or timothy 



